screen goes black switching between external

HP pavilion dv8000ca tech user groupMy computer screen goes black when switching between external and internal display. On startup the screen is usually black (dead). I have to use the internal external screen switch (Fn F4) several times to get my screen to work.It then will finally light up - sometimes in external screen mode or sometimes in internal screen.

If i have display settings in shutdown mode after .. so many minutes /hour, etc.then it is back to the same problem of switching several times to get my screen back.

Help !!!! please I would be sooooo grateful. This is a long time problem.ThanksDave

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